I had the same prob and asked the fine folks here the exact same thing. Solution: A foldable metal step that goes over the rear tire that simply folds up and gets placed inside the box leaning up against the outside wall. Works great. BUT (isn't there a always one of these?), 2 things to watch for. 1. cotter pins may fall out. 2. Careful not to hit side of box (outside/painted) when taking in/out. Has many adjustments and once it's set, don't have to fuss w/ it again. Forgot where I purchased it from, but want to say Amazon???